Stenciling-machine.



S. T. SMITH, JR.

STENOILING MACHINE.

APPLICATION FILED APE.26, 1912.

1,095,428. Patented May 5, 1914.

FIG. I.

O cow 7; FIG. 2.

[i i w Z /l g 4 ,5 flfzziia 1 a 5 *il /z Z5 Q s 2% WITNESSES: v. INVENTQR: m4 m a COLUMBIA PLANOORAPH c0., WASHINGTON D UNITED srnwnn'r orio STEPHEN T. SMITH, JR., 0F STAMFORD, CONNECTICUT, ASSIGNOR T0 UNDERWOOD TYPEWRITER COMPANY, A CORPORATION OF DELAWARE.

STENCILING-MACHINE.

To all whom it may concern:

Be it known that I, STEPHEN T. SMITH, J12, a citizen of the United States, residing in Stamford, in the county of Fairfield and Stateof Connecticut, have invented certain new and useful Improvements in Stenciling Machines, of which the following is a specification.

This invention relates to an ink fountain or receptacle for use in a stencil machine, such as shown for instance, in the United States patent to E. F. Kunath, No. 824,695, dated June 26, 1906, in which ink is applied to the inner surface of a foraminous cylinder around which is wrapped an inking pad on which is placed a stencil sheet.

The principal objects of the invention are to provide convenient means for supplying ink to the stencil cylinder, and to do so conveniently and quickly and without the necessity of soiling the fingers of the operator; to provide an ink fountain which can be readily cleaned while in position; and also to provide for inspection and cleaning of the ink fountain apart from the stencil machine.

One of the principal features of the invention consists in placing the ink fountain entirely outside of the stencil cylinder, where it is conveniently filled, emptied, cleaned and inspected; provision being made for the flow of ink from such exterior fountain to the interior of the stencil cylinder.

Another feature. consists in means for forcibly feeding the ink to the inside of the cylinder.

In the preferred form of the invention there is provided an ink fountain or reser voir on the frame of a rotary stenciling machine, which machine may be of any ordinary type having an axle or a spindle on which a hub turns. From this reservoir extends through said axle or spindle a tube into the interior of the rotating cylinder of the stenciling machine. This reservoir is airtight and is arranged to contain a piston, so that ink may be forced by said piston through the tube above described. There are provided openings in this reservoir for enabling it to be readily filled and drained. The piston is arranged to be moved by a hand wheel so that it may be readily caused to feed the ink. The tube or duct which Specification of Letters Patent.

Application filed April 26, 1912.

Patented May 5, 1914. Serial No. 693,316.

conveys the ink to the interior of the stenciling cylinder has an outlet on its lower side, which outlet is normally kept closed by a spring valve. When, however, the hand wheel is turned to feed the ink, this valve is arranged to be automatically opened by the pressure of the ink.

Other features and advantages will here inafter appear.

In the accompanying drawings, Figure 1 is a perspective view of a stenciling device with my inking mechanism. Fig. 2 is a sectional elevation view of the same.

A cylindrical ink reservoir 1 comprising an opening 2 through which it may be filled, contains a piston 3 having a threaded hub at, which piston is arranged to be moved back and forth by means of a hand operated screw shaft 5 working in said hub. As said piston 3 travels from the dotted line to the full line position in Fig. 2, it forces out any ink which may be in said ink reservoir, through a duct 5 in a hollow spindle 6 of a stenciling machine. This hollow spindle is removably mounted on a cross-bar 7 of the frame of said stenciling machine, and may extend substantially to the center of the rotatable cylinder 8 of said machine. Near its inner end, the spindle is provided with an aperture 9 through which ink may drop on to the metal surface 10 co-ntaining'perforations 11 through which perforations the ink may pass to a cloth or pad 12 at the outside of said cylinder. Around the'cloth on the outside of the cylinder may be stretched a stencil sheet in the ordinary manner.

The filling opening 2 of the ink reservoir, and a draining opening 13 situated opposite said opening 2, are both closed by screw plugs 14 having faces which extend down, so that the piston in passing will pass with very little clearance, and so the piston forces practically all the ink out through the duct 5. A stuffing box 15 on the shaft 5 prevents any escape of ink where said shaft passes through the walls of the reservoir. As the ink comes along the duct 5, it pushes aside a valve 16 which is normally pressed by a spring 17 to hold said duct closed to prevent any tendency of the ink to drip. Dripping may also be arrested by turning the hand wheel to draw the piston back and so draw the ink into the reservoir again. Said cylso i held against removal by means of a spring l latch 18 catching in a slot 19- on the hub of said cylinder. The opposite end of the cylinder is supported in the usual. manner by rolls 20 on uprights 21, extending from the base 23 of the stenciling machine.

Cross rods 24 in the ink reservoir prevent the piston 3 from turning with the shaft 5, and so compel it to be fed forward as above described. The spindle ('3 is locked on the cross-bar 7 of the stenciling machine by means of a set screw The cylinder 8 may be released by lifting the latch 18 and then slipped endwise off the spindle 6. After the cylinder 8 has been removed, the set screw 25 may be loosened and the spindle 6 and the ink reservoir 1 removed. The duct 5 and the ink reservoir may be then easily cleaned owing to the fact that the ink reservoir has two openings.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a stenciling machine, the combination with a cylinder, of a spindle on which said cylinder revolves, said spindle having an opening therein, means for feeding ink through said opening, and an automatic valve in the cylinder movable over said opening into and out of position to out off the flow of ink,

2. In a stenciling machine, the combination with a cylinder, of a spindle on which said cylinder revolves, said spindle formed with an opening therein and with an aperture extending from said-opening adjacent the middle of the axis of said cylinder, a valve in said opening adjacent to and controlling said aperture, and an ink reservoir arranged to feed ink past said valve.

3. In a stenoiling machine, the combination with a rotatable cylinder, of a tube extending along the axis of said cylinder and providing an opening through which ink may be fed, said tube having an aperture communicating with said opening near the center of the axis of said cylinder, a spring valve tending to close said aperture, and an ink reservoir arranged to feed ink through said opening.

4i. In a stenciling machine, the combination with a rotatable cylinder, of a fixed spindle iipon which said cylinder rotates, said spindle having an opening therein through which ink may be fed, an ink reservoir fixed on said spindle, a piston in said reservoir, said reservoir having two openings on different sides thereon, means for closing said openings for preventing escape of ink around said piston as it passes said openings, and a hand wheel for moving said piston.

5. In a stenciling machine, the combinir tion with a rotatable cylinder, of a spindle on which it is movably mounted, a standard on which said spindle is movably mounted, said spindle having an opening through which ink may be fed, a reservoir, means to force ink from the reservoir through said opening, and a valve in the cylinder working over said opening and controlled by the pressure of the ink for controlling the flow of ink through the opening.

(5. In a stenciling machine, the combination with a rotatable cylinder, of a fixed spindle on which it rotates, said spindle having an opening therein, an ink reservoir fast to said spindle, and means in said reservoir for positively feeding ink to said opening and withdrawing ink from said opening.

7. In a stenciling machine, the combina tion with a rotatable cylinder, of a fixed spindle on which it rotates, said spindle having an opening therein, an aperture extending from said" opening to the interior of said cylinder, a valve normally tending to close said openin and an ink reservoir comprising a member arranged to positively feed ink past said valve and .to withdraw said ink into the reservoir.

8. In a stenciling machine, the combination with a rotatable cylinder, of a hollow spindle on which said cylinder rotates, said spindle having an aperture extending from the interior of said spindle to the interior of said cylinder, an ink reservoir, a valve normally closing said aperture so that ink will not tend to drip when the machine is idle, and means for positively feeding ink from said reservoir.

9. In a stenciling machine, the combination of a hollow spindle, a frame in which the spindle is secured, a cylinder rotatable on the spindle, a releasable device to hold the cylinder against longitudinal movement during rotation and permitting the cylinder to be removed from the spindle by an endwise movement, an ink reservoir connected to the spindle, and means for forcing ink from the reservoir through the hollow spindle to the interior of the cylinder.

10. In a stenoiling machine, the combination of a frame, a hollow spindle extended through a bearing in the frame and removably secured therein, an ink reservoir can ried by said spindle outside the frame, a cylinder rotatably mounted on the spindle, a latch releasably holding the cylinder against endwise movement during rotation, and means to feed ink from the reservoir through the hollow spindle.

11. In a stenciling machine, the combination with a rotatable cylinder, of a hollow spindle forming an axis for the cylinder, said spindle being provided with an aperture forming communication between .the

interior of the spindle and the cylinder, :1. transmitted to said valve to move it into p0- reservoir connected With the spindle and sition to open said aperture.

supplying ink through the spindle and said aperture, a spring-pressed valve ithin the STEPHEN SMIIH spindle in position to cut ofi the flow of Witnesses:

ink, and means for applying pressure to the GEORGE E. MEWING, ink in the reservoir, the pressure being C. RIPLEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. O. 

